अच्छेद्योऽयमदाह्योऽयमक्लेद्योऽशोष्य एव च।नित्यः सर्वगतः स्थाणुरचलोऽयं सनातनः॥
acchedyo ’yam adāhyo ’yam akledyo ’śoṣya eva canityaḥ sarva-gataḥ sthāṇur acalo ’yaṃ sanātanaḥ
Word by word
The verse says
It cannot be cut, cannot be burned, cannot be soaked, cannot be dried. It is constant, everywhere, unmoving, fixed, there from the beginning.
In plain words
The same four denials again, then five positive words.
Krishna repeats himself deliberately. The negatives from verse 23 come back as adjectives, and then he adds what it is rather than what it is not.
Constant. Everywhere. Unmoving. Fixed. Ancient.
Where you've felt this · in study
Your father explains the insurance form, then explains it again in different words. He is not padding it out. He watched the first version go straight past you, and he is laying a second track alongside it.
Going deeper
The repetition is not accidental and it is not filler.
Verse 23 stated the denials as events: fire does not burn it. This verse states them as properties: it is unburnable. That is the difference between reporting what happened and describing what something is.
Then sarva-gata - all-pervading - arrives, and it changes the scale. Up to here Krishna could have been describing something small and private, one soul sealed inside each body. This word says otherwise, and it is the seed of what Chapters 7 to 11 grow into.
There is a real tension in the list, worth noticing rather than tidying away. All-pervading sits directly beside two words meaning unmoving and fixed. How is something both everywhere and perfectly still?
The answer the tradition gives is that it has no need to move, because there is nowhere it is not. Moving is for things that are somewhere and would rather be somewhere else.
Whether that satisfies you is another matter, and you are allowed to find that it does not. The Gita is describing something it calls acintya, not thinkable, and you can hear the language straining at the job.